How many triangles can you make using sticks that are 3cm, 4cm and 5cm long?

Let's Investigate Triangles

Stage: 1 Challenge Level:

Have you made triangles with all the sides the same colour?
Have you made triangles with all the sides different colours?
Have you found three sticks you can't make a triangle with?This sheet will give you four copies of each strip in the colours in the problem, which you could print off and cut out.

The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the
NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to
embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities
can be found here.